^ was going to mention about stechnic
also as pimpreza said, patience is good. i waited for about 8 months for my exhaust and i saved around $250 off the price
also is it not a fine of 10k if you don't have a cat in your car? dis regard if i am wrong...
also i think like kato said the smell will be diffrent, but i think more so when you are reversing.
cops if they know what they are doing will tap your exhaust to check for the cat